/*
 *  Copyright 2005 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.ibatis.ibator.internal.db;

import java.sql.Connection;
import java.sql.Driver;
import java.sql.SQLException;
import java.util.Properties;

import org.apache.ibatis.ibator.config.JDBCConnectionConfiguration;
import org.apache.ibatis.ibator.internal.IbatorObjectFactory;
import org.apache.ibatis.ibator.internal.util.StringUtility;
import org.apache.ibatis.ibator.internal.util.messages.Messages;

/**
 * This class assumes that classes are cached elsewhere for performance reasons, but also to make sure that any native
 * libraries are only loaded one time (avoids the dreaded UnsatisfiedLinkError library loaded in another classloader)
 * 
 * @author Jeff Butler
 */
public class ConnectionFactory
{
    
    private static ConnectionFactory instance = new ConnectionFactory();
    
    public static ConnectionFactory getInstance()
    {
        return instance;
    }
    
    /**
     *  
     */
    private ConnectionFactory()
    {
        super();
    }
    
    public Connection getConnection(JDBCConnectionConfiguration config)
        throws SQLException
    {
        Driver driver = getDriver(config);
        
        Properties props = new Properties();
        
        if (StringUtility.stringHasValue(config.getUserId()))
        {
            props.setProperty("user", config.getUserId()); //$NON-NLS-1$
        }
        
        if (StringUtility.stringHasValue(config.getPassword()))
        {
            props.setProperty("password", config.getPassword()); //$NON-NLS-1$
        }
        
        props.putAll(config.getProperties());
        
        Connection conn = driver.connect(config.getConnectionURL(), props);
        
        if (conn == null)
        {
            throw new SQLException(Messages.getString("RuntimeError.7")); //$NON-NLS-1$
        }
        
        return conn;
    }
    
    private Driver getDriver(JDBCConnectionConfiguration connectionInformation)
    {
        String driverClass = connectionInformation.getDriverClass();
        Driver driver;
        
        try
        {
            Class<?> clazz = IbatorObjectFactory.externalClassForName(driverClass);
            driver = (Driver)clazz.newInstance();
        }
        catch (Exception e)
        {
            throw new RuntimeException(Messages.getString("RuntimeError.8"), e); //$NON-NLS-1$
        }
        
        return driver;
    }
}
